diff --git a/server/index.js b/server/index.js
index 7a69e2d..b2e9583 100644
--- a/server/index.js
+++ b/server/index.js
@@ -137,7 +137,7 @@ app.use((req, res, next) => {
         baseUri: ["'self'"],
         frameAncestors: ["'none'"],
         formAction: ["'self'"],
-        upgradeInsecureRequests: process.env.NODE_ENV === 'production' ? [] : null
+        upgradeInsecureRequests: process.env.TRUST_PROXY ? [] : null
       }
     },
     hsts: {